docx-js/demo/demo14.ts

// Page numbers
// Import from 'docx' rather than '../build' if you install from npm
import * as fs from "fs";
import { AlignmentType, Document, Header, Packer, Paragraph, TextRun } from "../build";

const doc = new Document();

doc.addSection({
    headers: {
        default: new Header({
            children: [
                new Paragraph({
                    alignment: AlignmentType.RIGHT,
                    children: [new TextRun("My Title "), new TextRun("Page ").pageNumber()],
                }),
            ],
        }),
        first: new Header({
            children: [
                new Paragraph({
                    alignment: AlignmentType.RIGHT,
                    children: [new TextRun("First Page Header "), new TextRun("Page ").pageNumber()],
                }),
            ],
        }),
    },
    children: [
        new Paragraph({
            text: "First Page",
        }).pageBreak(),
        new Paragraph("Second Page"),
    ],
});

const packer = new Packer();

packer.toBuffer(doc).then((buffer) => {
    fs.writeFileSync("My Document.docx", buffer);
});